C. prevent future international conflicts after World War II.
Explanation:
The United Nations is an international organization founded in 1945 after the Second World War by 51 countries committed to maintaining international peace and security, developing friendly relations among nations and promoting social progress, better living standards and human rights.
The author's main purpose was the explain that the Community Service Council was effectual to high school students. The personal backstory was to add more evidence of the effectiveness.
